41th international conference on plasma physics and CF, February 10 – 14, 2014, Zvenigorod
DETERMINATION OF MAXIMUM AMOUNT OF CONFINED PARTICLES IN LINEAR
PAUL TRAP AT ATMOSPHERIC PRESSURE IN AIR
Deputatova L.V., Filinov V.S., Lapitsky D.S., Pecherkin V.Ya., Syrovatka R.A.,
Vasilyak L.M., Vladimirov V.I.
Joint Institute for High Temperatures of the Russian Academy of Sciences,Moscow,
dmitrucho@yandex.ru
In this work the behavior of the charged dust particles in the linear Paul trap is studied. The
behavior of dust particles is simulated by Brownian dynamics. Regions of dust particle confinement
were found in wide range of parameters: size of dust particles, its density and charge; dimensions of
linear Paul trap, frequency and voltage at electrodes of the trap. Results of simulation agree with
experimental results.
In this work regions of dust particle confinement were found in wide range of parameters. The
dynamics of a cloud of dust particles at different ratio Qp/mp in linear Paul trap at high gas pressure
was studied where Qp and mp are dust particle charge and mass respectively.
Maximum amount of confined particles in linear Paul trap [1] as function of ratio Qp/mp and
frequency f of electrodynamics field was found. Maximum amount of confined particles at
experiment was 50-100 pfrticles and at simulation – 156 particles.
Comparison of simulation and experimental result of dynamics of dust particle assembly was
performed. At similar conditions: type of dust particles, size and its charge, dimensions of linear
Paul trap and applied voltages results of simulation agree with experimental results. Comparison of
simulation results of dust particle catching (ρp = 0.38*104 kg/m3, rp = 10 μm, Qp = 4,5*105 e) and
experimental results (ρp = 0.38*104 kg/m3, rp = 10 μm, Qp = 4,5*105 e) is shown at pic. 1.
Pic. 1. Slice of confined cloud of dust particles 2 mm width (side view).
Trap dementions: Lm = 15 cm, Lb = 1,3 cm, Lh = 6 cm, end electrodes 5 length – 4,5 cm, diameter of
each electrode d = 3 mm. Applied voltage at electrodes 1 and 2 is Uω*sin(ωt), at 3,4 – -Uω*sin(ωt).
At end electrodes repulsive voltage Uend is applied. Parameters of experiment: f = 50 Hz, Uω = 4.4
kV, Uend = 900 V, Qp (experiment) = 5-5*105 e, Qp (simulation) = 4.5*105 e, ρp = 0,38*104 kg/m3, rp =
10 μm, Т = 300 K, η = 17,2 μPa*s.
References
[1]. Vasilyak L.M., Vladimirov V.I., Deputatova L.V., Lapitsky D.S., Molotkov V.I., Pecherkin
V.Ya., Filinov V.S., Fortov V.E. Coulomb stable structures of charged dust particles in a
dynamical trap at atmospheric pressure in air // New Journal Physics. 2013. 15. 043047.
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